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post #1 of 17 (permalink) Old 10-04-2010, 07:41 PM Thread Starter
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Big Bore 800/840

I'm thinking of installing a big bore kit in my 09. It already has duel exhaust, MSD, Air box removed with [email protected] and outerwear. It will soon have a clutch kit. Which kit would be the better way to go? 800 or 840cc. What compression ratio with running only super unleaded? I want good reliability without having to up grade the coolant system. Best bang for buck. 50% sand dunes 50% dirt trails.
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post #2 of 17 (permalink) Old 10-04-2010, 08:44 PM
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I'm thinking of installing a big bore kit in my 09. It already has duel exhaust, MSD, Air box removed with [email protected] and outerwear. It will soon have a clutch kit. Which kit would be the better way to go? 800 or 840cc. What compression ratio with running only super unleaded? I want good reliability without having to up grade the coolant system. Best bang for buck. 50% sand dunes 50% dirt trails.
Please get rid of your K&N filter!! Got pics and engine builds to prove they let too much dirt pass.

If you don't want heat issues and total reliability get a std bore kit, we sell AMR kits and have everything you need and the set ups to go with it.

We also do the 840 from AMR too if you have too!! LOL



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post #3 of 17 (permalink) Old 10-05-2010, 01:23 AM
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Get the 840...no replacement for displacement...PERIOD...I run the dunes and a little bit of trails...best bang for the buck is a 840...and we only run pump gas so your good to go...

I disagree with Todd...and so does just about every other 840 owner...total reliability with the 840 kit...you will have to upgrade the cooling system but that's about standard with any upgrades...in my humble opinion...but the HP you get in return is WELL worth the investment...in my humble opinion...
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post #4 of 17 (permalink) Old 10-05-2010, 06:38 AM
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post #5 of 17 (permalink) Old 10-05-2010, 06:53 AM
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Get the 840...no replacement for displacement...PERIOD...I run the dunes and a little bit of trails...best bang for the buck is a 840...and we only run pump gas so your good to go...

I disagree with Todd...and so does just about every other 840 owner...total reliability with the 840 kit...you will have to upgrade the cooling system but that's about standard with any upgrades...in my humble opinion...but the HP you get in return is WELL worth the investment...in my humble opinion...
I will admit the AMR 840 kit we sell and have installed is growing on me and we have not had issues with it like we have other brand kits.

A little more time on them and us and I will probably be a fan but I am slow to change!! LOL



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post #6 of 17 (permalink) Old 10-05-2010, 05:44 PM
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I agree with Sandjunkie 100% . Dont let the neagh sayers scare you.. I have a FST840 and ride with Merlin that has a FST840 with 11/2 valves and extensive head work.. Also has nitros ( very scary when he hits that).. Point is we ride ours HARD.. Not ONE ISSUE.. Makes RZRS guys cry when we ride with them Look you will have to upgrade your cooling no matter which direction you go. Like many on hear have said.. Standards are great.. That is untill you ride the 840

Merlin Motorsports custom Teryx
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post #7 of 17 (permalink) Old 10-06-2010, 09:01 AM
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kywildcat74 What all cooling changes have you and merlin had to do to get it right. Im saving up to do the 840 asap

09 teryx- msd ignition - water impellar - half windsheild - uni filter - standard muzzy - sdr rear bumper - hid lights - dalton clutch- water temp guage - ss108 14 inch with terra cross - dasa kebc block off plate - brake alarm buzzer - over drive plate -ssv works sound system -removable canvas top-odyssey battery- rock sliders
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post #8 of 17 (permalink) Old 10-06-2010, 07:57 PM
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kywildcat74 What all cooling changes have you and merlin had to do to get it right. Im saving up to do the 840 asap
We ride in Kentucky no dunes.. It is hot in the summer.. Average temps 90-100 deg.. All trail rides, big hills.. Alot of shade. I am saying this because if you ride in the dunes you might have to do more to your cooling system than what we had to do. But what worked for us is DASA impellor, engine ice coolant, and fan overide switch for mine( 08) Merlins 09 did not need the overide switch. I hope this helps.. If you are a big dune rider in Hot temps you may have to install the larger radiator & fan Dasa sells for $595... Oh and you need to tune your air/fuel to 12.5to 13.1..Top end should be no leaner than 13.1 mid 12-12.5 low can be 12.. you will get the best performance and still be able to control your engine temps.

Merlin Motorsports custom Teryx

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post #9 of 17 (permalink) Old 10-06-2010, 09:47 PM
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We ride in Kentucky no dunes.. It is hot in the summer.. Average temps 90-100 deg.. All trail rides, big hills.. Alot of shade. I am saying this because if you ride in the dunes you might have to do more to your cooling system than what we had to do. But what worked for us is DASA impellor, engine ice coolant, and fan overide switch for mine( 08) Merlins 09 did not need the overide switch. I hope this helps.. If you are a big dune rider in Hot temps you may have to install the larger radiator & fan Dasa sells for $595... Oh and you need to tune your air/fuel to 12.5to 13.1..Top end should be no leaner than 13.1 mid 12-12.5 low can be 12.. you will get the best performance and still be able to control your engine temps.
Well said...I can only add I suggest a oil cooler kit if you can...mine saved my engine more than once...I got it from PWR but I am sure there are others...it's just a nice piece of mind add on and it really works...in my humble opinion...
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post #10 of 17 (permalink) Old 10-06-2010, 11:28 PM
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I agree with you SandJunkie I am a huge fan of oil cooler, bottom line if your cooling the oil your cooling your engine PERIOD..

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